The bug was introduced between OpenACS 5.6.0 and OpenACS 5.7.0 and effects only upgrades. i wonder, why we don't see more complaints about this. Anyhow, i've added an upgrade script to the oacs-5-8 branch. Please either upgrade from CVS, or wait until tomorrow and do an "upgrade from repository" when you are using OpenACS 5.8.0.